Portable cooler



FIG. 1 is a perspective view of a portable cooler showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a side elvational view showing the side thereof opposite that shown in FIG. 2;

FIG. 4 is an end elevational view thereof;

FIG. 5 is an end elevational view showing the end thereof opposite that shown in FIG. 4;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a portable cooler, as shown. 